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Goodwill and Other Intangible Assets (Change in Goodwill) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Goodwill [Roll Forward]  
Balance at December 31, 2020 $ 635,854
Effect of foreign currency translation 1,656
Balance at June 30, 2021 $ 637,510